Description
Title: On a CrOx-ZrO2-SiO2 Catalyst for Non-Oxidative Propane Dehydrogenation Using a One-Pot Template-Assisted Method to Prepare
Abstract: Through the use of templates, an evaporation-induced self-assembly process, and a “one-pot” method, a series of CrOx-ZrO2-SiO2 (CrZrSi) catalysts were created. Assuming Cr2O3 stoichiometry, the chromium content ranged from 4 to 9 weight percent. XRD, SEM-EDX, temperature-programmed reduction (TPR-H2), Raman spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the catalysts. At 500–600 C, the catalysts were tested in non–oxidative propane dehydrogenation. By subjecting the catalysts to a reductive treatment with H2, the evolution of active sites under the reaction conditions was examined. Amorphous Cr3+ and dispersed Cr6+ species were initially present in the catalyst with the lowest Cr loading. The latter reduced in a reaction environment, forming a low-activity Cr3+ oxide species during the dehydrogenation of propane. Higher Cr loading catalysts initially had highly dispersed Cr3+ species that were able to withstand the reaction conditions and were in charge of the high catalyst activity. Silica served as a stabilizer that prevented the crystallization of Cr2O3 and ZrO2 and enabled the formation of coordinatively unsaturated Zr4+ centers as well as a textural promoter that increased the specific surface area of the catalysts. The catalyst with the highest Cr loading had the ideal ratio of coordinatively unsaturated Zr4+ centers to Cr3+ species. The catalyst with the highest efficiency was this one.
Keywords: propane dehydrogenation; propylene; mixed oxide catalysts; chromia; zirconia; one-pot synthesis
Paper Quality: SCOPUS / Web of Science Level Research Paper
Subject: Chemistry
Writer Experience: 20+ Years
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